Indian Institute of Science Education and Research-Kolkata, Mohanpur, Nadia 741252, India.
Phys Rev Lett. 2011 Dec 30;107(27):270401. doi: 10.1103/PhysRevLett.107.270401. Epub 2011 Dec 27.
We study trapped 2D atomic Bose-Einstein condensates with spin-independent interactions in the presence of an isotropic spin-orbit coupling, showing that a rich physics results from the nontrivial interplay between spin-orbit coupling, confinement and interatomic interactions. For low interactions two types of half-vortex solutions with different winding occur, whereas strong-enough repulsive interactions result in a stripe-phase similar to that predicted for homogeneous condensates. Intermediate interaction regimes are characterized for large enough spin-orbit coupling by an hexagonally-symmetric phase with a triangular lattice of density minima similar to that observed in rapidly rotating condensates.
我们研究了在各向同性自旋轨道耦合存在下具有自旋无关相互作用的被困二维原子玻色-爱因斯坦凝聚体，结果表明，自旋轨道耦合、约束和原子间相互作用之间的复杂相互作用产生了丰富的物理现象。对于低相互作用，会出现两种具有不同缠绕的半涡旋解，而足够强的排斥相互作用则导致类似于均匀凝聚体预测的条纹相。对于足够大的自旋轨道耦合，中间相互作用区域的特征是具有类似于在快速旋转凝聚体中观察到的密度极小三角形晶格的六边形对称相。
